docs: def url(self):
          """
          Returns the URL for the instance, which can be used
          to retrieve, delete, and overwrite the file. If security is enabled, signature and policy parameters will
          be included,
  
          *returns* [String]
  
          ```python
          filelink = client.upload(filepath='/path/to/file')
          filelink.url
          # https://cdn.filestackcontent.com/FILE_HANDLE
          ```
          """
          return get_url(CDN_URL, handle=self.handle, security=self.security)